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Inductive sensor

a sensor and inductive technology, applied in the field of inductive sensors, can solve the problems of unsuitability of plastic covers, etc., and achieve the effect of simplifying the manufacture of sensors

Active Publication Date: 2008-09-04
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a sensor that can be easily manufactured and has a simplified structure. The sensor includes a metal plate that acts as a stable substrate for the conducting coil and an insulating layer that can be applied to the metal plate. The insulating layer can be very thin, and a centrifuge method can be used to apply the insulating layer to the metal plate. The sensor can be manufactured in a cost-effective way by simultaneously applying the conducting coil and the insulating layer to the metal plate and then cutting the plate into pieces. The sensor has a housing with at least one opening that allows for easy access to the conducting coil and the evaluation electronics. The sensor can be welded to the housing, and the welded connection is strong and fluid-tight. The sensor is suitable for various applications and can be easily manufactured.

Problems solved by technology

A cover made of a plastic would also be unsuitable since assuring the required durability would require it to be too thick.

Method used

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Embodiment Construction

[0028]In FIGS. 1 and 2, an inductive sensor according to the present invention is labeled as a whole with the reference numeral 10. It includes a housing 40 with an oblong hole-shaped passage 46 that has a first opening 41 and second opening 42 at its ends. The housing is composed of rustproof, nonmagnetic steel and is manufactured by means of the metal-injection-molding method (MIM method).

[0029]The first opening 41 of the housing is connected to a metal plate 100 μm thick composed of rustproof, nonmagnetic steel. In FIG. 1, seven contact surfaces 24 are depicted on the metal plate, arranged in two rows. Between the contact surfaces 24, the conducting coils (not shown) are provided, which according to the exemplary embodiment in FIG. 9, are embodied in conjunction with FIG. 16 of EP 1 164 358 B1. The contact surfaces 24 are connected to the conducting coils in an electrically conductive fashion.

[0030]In addition, there is a flexible printed circuit board 60 equipped with a contacti...

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Abstract

An inductive sensor has an electrically nonconductive substrate, at least one electrically conducting coil that is integrally joined to the substrate, with the mechanical rigidity of the substrate significantly greater than that of the conducting coil, a metal plate covering the conducting coil, with the substrate comprised by the metal plate, and with the surface of the metal plate on the side oriented toward the conducting coil provided with an electrically insulating layer.

Description

CROSS-REFERENCE TO A RELATED APPLICATION[0001]The invention described and claimed hereinbelow is also described in German Patent Application DE 10 2007 009 994.2 filed on Mar. 1, 2007. This German Patent Application, whose subject matter is incorporated here by reference, provides the basis for a claim of priority of invention under 35 U.S.C. 119(a)-(d).BACKGROUND OF THE INVENTION[0002]The invention relates to an inductive sensor, a position measuring system equipped with this sensor, and a method for its manufacture.[0003]An inductive sensor is known, for example, from EP 0 743 508 A2, whose FIGS. 16A and 16B show a sensor in which a number of electrical conducting coils 102, 104 are applied to a substrate 126. The conducting coils are situated in a number of layers that are electrically separated from one another by thin insulating layers 162. An insulating layer 162 is also used to cover the sensor so that the conducting coils are protected from environmental influences, e.g. fro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G01D5/20H01F41/00
CPCF16C29/00Y10T29/4902G01D5/2006G01B7/023G01B7/14
Inventor REUSING, GUENTERHOLLWECK, ROMANHAUSER, KARINSTIER, ANTONHOHNKE, FLORIAN
Owner ROBERT BOSCH GMBH
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